Structure and Magnetization Dynamics of Dy−Fe and Dy−Ru Bonded Complexes
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We present an investigation of isostructural complexes that feature unsupported direct bonds between a formally trivalent lanthanide ion (Dy3+ ) and either a first-row (Fe) or a second-row (Ru) transition metal (TM) ion. The sterically rigid, yet not too bulky ligand PyCp22- (PyCp22- =[2,6-(CH2 C5 H3 )2 C5 H3 N]2- ) facilitates the isolation and characterization of PyCp2 Dy-FeCp(CO)2 (1; d(Dy-Fe)=2.884(2) Å) and PyCp2 Dy-RuCp(CO)2 (2; d(Dy-Ru)=2.9508(5) Å). Computational and spectroscopic studies suggest strong TM→Dy bonding interactions. Both complexes exhibit field-induced slow magnetic relaxation with effectively identical energy barriers to magnetization reversal. However, in going from Dy-Fe to Dy-Ru bonding, we observed faster magnetic relaxation at a given temperature and larger direct and Raman coefficients, which could be due to differences in the bonding and/or spin-phonon coupling contributions to magnetic relaxation.
author list (cited authors)
Burns, C. P., Yang, X., Wofford, J. D., Bhuvanesh, N. S., Hall, M. B., & Nippe, M.